| 摘要 |
FRICTION BODY, WRITING INSTRUMENT AND WRITING INSTRUMENT SET There is provided a friction body which is adapted to rub a thermochromic image or handwriting formed on a paper surface by use of thermochromic ink to thermally discolor the thermochromic image or handwriting by frictional heat resultant from rubbing, a thermal conductivity of a friction portion of the friction body is set to be within 0.05 W/(m.K) to 50 W/(m.K). |
